IPv4 R&E Routing Table Report 17:05 GMT Tue 19 Aug, 2025 IPv4 BGP Table (R&E) as seen at ASREN. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/ASREN/ Analysis Summary ---------------- BGP routing table entries examined: 13187 Prefixes after maximum aggregation (per Origin AS): 7919 Deaggregation factor: 1.67 Unique aggregates announced (without unneeded subnets): 8678 Number of IPv4 prefixes with a valid ROA: 5684 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7502 Total ASes present in the Internet Routing Table: 2024 Prefixes per ASN: 6.52 Origin-only ASes present in the Internet Routing Table: 1752 Origin ASes announcing only one prefix: 824 Transit ASes present in the Internet Routing Table: 272 Transit-only ASes present in the Internet Routing Table: 44 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 4.5 Max AS path length visible: 15 Max AS path prepend of ASN (327947) 11 Prefixes from unregistered ASNs in the Routing Table: 32 Number of instances of unregistered ASNs: 32 Number of 32-bit ASNs allocated by the RIRs: 47206 Number of 32-bit ASNs visible in the Routing Table: 525 Prefixes from 32-bit ASNs in the Routing Table: 1332 Number of bogon 32-bit ASNs visible in the Routing Table: 0 Special use prefixes present in the Routing Table: 0 Prefixes being announced from unallocated address space: 2 Number of addresses announced to Internet: 158151360 Equivalent to 9 /8s, 109 /16s and 50 /24s Percentage of available address space announced: 4.3 Percentage of allocated address space announced: 4.3 Percentage of available address space allocated: 100.0 Percentage of address space in use by end-sites: 99.6 Total number of prefixes smaller than registry allocations: 1548 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3446 Total APNIC prefixes after maximum aggregation: 1758 APNIC Deaggregation factor: 1.96 Prefixes being announced from the APNIC address blocks: 3444 Unique aggregates announced from the APNIC address blocks: 1907 APNIC Region origin ASes present in the Internet Routing Table: 450 APNIC Prefixes per ASN: 7.65 APNIC Region origin ASes announcing only one prefix: 208 APNIC Region transit ASes present in the Internet Routing Table: 43 Average APNIC Region AS path length visible: 4.1 Max APNIC Region AS path length visible: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 203 Number of APNIC addresses announced to Internet: 37667424 Equivalent to 2 /8s, 62 /16s and 194 /24s APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431 (pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319, 58368-59391, 63488-64098, 64297-64395, 131072-155961 APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8, 49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8, 106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8, 116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8, 123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8, 163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8, 222/8, 223/8, ARIN Region Analysis Summary ---------------------------- Prefixes being announced by ARIN Region ASes: 5514 Total ARIN prefixes after maximum aggregation: 3233 ARIN Deaggregation factor: 1.71 Prefixes being announced from the ARIN address blocks: 5559 Unique aggregates announced from the ARIN address blocks: 3596 ARIN Region origin ASes present in the Internet Routing Table: 881 ARIN Prefixes per ASN: 6.31 ARIN Region origin ASes announcing only one prefix: 312 ARIN Region transit ASes present in the Internet Routing Table: 118 Average ARIN Region AS path length visible: 5.0 Max ARIN Region AS path length visible: 14 Number of ARIN region 32-bit ASNs visible in the Routing Table: 147 Number of ARIN addresses announced to Internet: 62694272 Equivalent to 3 /8s, 188 /16s and 163 /24s ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106 (pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153 3354-4607, 4865-5119, 5632-6655, 6912-7466 7723-8191, 10240-12287, 13312-15359, 16384-17407 18432-20479, 21504-23551, 25600-26591, 26624-27647, 29696-30719, 31744-33791 35840-36863, 39936-40959, 46080-47103 53248-55295, 62464-63487, 64198-64296, 393216-402332 ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8, 12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8, 20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8, 29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8, 40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8, 54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8, 131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8, 139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8, 148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8, 159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8, 167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8, 184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8, 207/8, 208/8, 209/8, 214/8, 215/8, 216/8, RIPE Region Analysis Summary ---------------------------- Prefixes being announced by RIPE Region ASes: 3149 Total RIPE prefixes after maximum aggregation: 2600 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3138 Unique aggregates announced from the RIPE address blocks: 2648 RIPE Region origin ASes present in the Internet Routing Table: 570 RIPE Prefixes per ASN: 5.51 RIPE Region origin ASes announcing only one prefix: 259 RIPE Region transit ASes present in the Internet Routing Table: 88 Average RIPE Region AS path length visible: 3.8 Max RIPE Region AS path length visible: 12 Number of RIPE region 32-bit ASNs visible in the Routing Table: 137 Number of RIPE addresses announced to Internet: 56384896 Equivalent to 3 /8s, 92 /16s and 93 /24s RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614 (pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631 6656-6911, 8192-9215, 12288-13311, 15360-16383 20480-21503, 24576-25599, 28672-29695 30720-31743, 33792-35839, 38912-39935 40960-45055, 47104-52223, 56320-58367 59392-61439, 61952-62463, 64396-64495 196608-216475 RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8, 53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8, 185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8, 217/8, LACNIC Region Analysis Summary ------------------------------ Prefixes being announced by LACNIC Region ASes: 489 Total LACNIC prefixes after maximum aggregation: 262 LACNIC Deaggregation factor: 1.87 Prefixes being announced from the LACNIC address blocks: 488 Unique aggregates announced from the LACNIC address blocks: 434 LACNIC Region origin ASes present in the Internet Routing Table: 36 LACNIC Prefixes per ASN: 13.56 LACNIC Region origin ASes announcing only one prefix: 15 LACNIC Region transit ASes present in the Internet Routing Table: 13 Average LACNIC Region AS path length visible: 4.4 Max LACNIC Region AS path length visible: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 9 Number of LACNIC addresses announced to Internet: 753760 Equivalent to 0 /8s, 11 /16s and 128 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-274844 + ERX transfers LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8, 191/8, 200/8, 201/8, AfriNIC Region Analysis Summary ------------------------------- Prefixes being announced by AfriNIC Region ASes: 557 Total AfriNIC prefixes after maximum aggregation: 62 AfriNIC Deaggregation factor: 8.98 Prefixes being announced from the AfriNIC address blocks: 556 Unique aggregates announced from the AfriNIC address blocks: 91 AfriNIC Region origin ASes present in the Internet Routing Table: 42 AfriNIC Prefixes per ASN: 13.24 AfriNIC Region origin ASes announcing only one prefix: 30 AfriNIC Region transit ASes present in the Internet Routing Table: 6 Average AfriNIC Region AS path length visible: 5.7 Max AfriNIC Region AS path length visible: 15 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 29 Number of AfriNIC addresses announced to Internet: 648704 Equivalent to 0 /8s, 9 /16s and 230 /24s AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8, APNIC Region per AS prefix count summary ---------------------------------------- ASN No of nets /20 equiv MaxAgg Description 2907 604 2169 462 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 181 4192 71 ERX-CERNET-BKB China Education and Resear 7575 167 281 113 AARNET-AS-AP Australian Academic and Rese 55824 148 19 21 NKN-CORE-NW NKN Core Network, IN 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 2697 56 4 33 ERX-ERNET-AS Education and Research Netwo 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 45773 48 3 5 HECPERN-AS-PK PERN AS Content Servie Prov Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 5786 199 16 1 UPRENET, PR 2920 178 34 7 LACOE, US 2152 148 491 97 CENIC-2152, US 18558 139 18 4 NETBLK-RCOEK, US 81 95 312 27 NCREN, US 21976 88 34 14 NJEDGE-NET, US 376 79 6 56 RISQ-AS, CA 1736 79 16 1 MU-AS, US 22742 69 37 32 CT-EDU-NET, US 1706 65 53 55 UNIV-ARIZ, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 284 1883 251 DFN Verein zur Foerderung eines Deutschen 786 190 1742 185 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Switch, Swiss Academic and Researc 1103 98 1503 84 SURFNET-NL SURFnet, The Netherlands, NL 2614 92 26 69 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 78 88 73 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 63 614 58 FR-RENATER Reseau National de telecommuni 200521 58 4 27 SEAP-AGE, ES Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 247 51 124 Rede Nacional de Ensino e Pesquisa, BR 11340 111 25 50 Red Universitaria Nacional, CL 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 18 40 18 UNIVERSIDADE DE SAO PAULO, BR 278 11 1 10 Universidad Nacional Autonoma de Mexico, 61468 10 1 9 CEDIA, EC 52888 9 6 6 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 28027 8 2 2 Escuela Superior Politecnica del Litoral, 27817 4 1 4 Red Nacional Academica de Tecnologia Avan 3596 3 0 3 Universidad Autonoma Metropolitana, MX Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 410 82 3 KENET-AS, KE 37215 38 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 327700 11 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 327947 7 4 1 KNUST-, GH 327798 4 0 3 BERNET, BI 328903 4 0 1 RITER, CI 37661 3 6 3 NRaE1-AS, NG Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2907 604 2169 462 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 36914 410 82 3 KENET-AS, KE 680 284 1883 251 DFN Verein zur Foerderung eines Deutschen 1916 247 51 124 Rede Nacional de Ensino e Pesquisa, BR 5786 199 16 1 UPRENET, PR 786 190 1742 185 JANET Jisc Services Limited, GB 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 181 4192 71 ERX-CERNET-BKB China Education and Resear 2920 178 34 7 LACOE, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 7497 452 429 CSTNET-AS-AP Computer Network Information Cente 36914 410 407 KENET-AS, KE 5786 199 198 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 178 171 LACOE, US 18558 139 135 NETBLK-RCOEK, US 55824 148 127 NKN-CORE-NW NKN Core Network, IN 1916 247 123 Rede Nacional de Ensino e Pesquisa, BR 4538 181 110 ERX-CERNET-BKB China Education and Research Net 1736 79 78 MU-AS, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.81.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.82.0/24 3112 OARNET-AS-1, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 164.160.192.0/21 Origin: 37661 NRaE1-AS, NG 164.160.192.0/21 Transit: 37288 WACREN, SN 203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP The University 203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res Complete listing at https://bgp.nsrc.org/REN/ASREN/data-add-IANA Number of prefixes announced per prefix length (Global) ------------------------------------------------------- /1:0 /2:0 /3:0 /4:0 /5:0 /6:0 /7:0 /8:0 /9:1 /10:1 /11:0 /12:9 /13:15 /14:30 /15:97 /16:1566 /17:275 /18:299 /19:413 /20:565 /21:593 /22:981 /23:1097 /24:7062 /25:56 /26:79 /27:48 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 387 410 KENET-AS, KE 1916 88 247 Rede Nacional de Ensino e Pesquisa, BR 200521 33 58 SEAP-AGE, ES 37215 32 38 MAREN, MW 25977 27 30 HCCS, US 32440 27 39 LONI, US 26898 24 64 RESERVED, ZZ 36794 24 26 META SOLUTIONS PIKETON, US 60187 23 48 LGFL-AS, GB 31638 21 21 ASN-LEPIDA, IT Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:16 8:2 12:1 14:92 23:4 24:2 31:1 35:1 37:14 38:3 40:1 41:124 42:13 44:5 45:24 46:5 47:1 49:12 58:15 59:17 60:6 62:5 63:3 64:29 65:3 66:15 67:31 68:2 69:12 70:2 72:7 74:11 76:22 77:6 78:3 79:9 80:8 81:26 82:2 83:7 84:6 85:28 87:1 89:9 91:36 93:15 94:2 95:1 96:5 98:2 101:2 102:11 103:286 104:72 108:4 109:1 111:17 114:1 118:33 119:31 121:28 122:8 123:8 124:42 128:31 129:32 130:93 131:53 132:51 133:156 134:79 136:198 137:44 138:11 139:5 140:25 141:1 142:21 143:12 144:22 145:4 146:123 147:13 148:9 149:11 150:7 151:4 152:76 153:13 154:14 155:39 156:128 157:4 158:25 159:116 160:32 161:20 162:15 163:72 164:8 165:3 167:9 168:35 169:5 170:9 173:5 175:4 179:6 180:16 182:2 184:6 185:39 187:5 188:14 190:1 191:2 192:1133 193:248 194:87 195:68 196:10 197:299 198:321 199:192 200:161 202:379 203:183 204:305 205:58 206:138 207:196 208:47 209:64 210:102 211:2 212:42 213:4 216:44 217:22 219:6 220:3 222:3 223:5 End of report